Performance of Windows in Walls With Continuous Insulation

John Peavey, Nay Shah, Lena Burkett (NREL Technical Monitor)

Research output: NRELTechnical Report


Window openings in walls are a significant contributor to poor thermal performance because of thermal bridging through the framing members (e.g., studs, joists, plates, bracing) and because windows lack the thermal properties of insulation. Window installation guidance for walls with continuous insulation (CI) is critical for continued market growth of this energy efficiency technology. This research project offers window manufacturers a starting point and a potential path toward developing installation instructions for windows over CI. The objectives of the research include evaluating the common method for installing windows in walls with CI, as well as establishing acceptance criteria for evaluating the performance of windows installed in walls with and without CI.
Original languageAmerican English
Number of pages74
StatePublished - 2023

NREL Publication Number

  • NREL/TP-5500-82494

Other Report Number

  • DOE/GO-102023-5719


  • Building America
  • continuous insulation
  • envelope
  • Home Innovations Lab
  • windows


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